Induction-coil



I. B. REPLOGLE.

INDUCTION COIL. APPLICATION FILED JUNI-113, ISIS.

LLIITNEEEEE ./5

J. B. REPLOGLE. xNnu'cHoN com.

Patented Dec. 27, 192i.

2 SHEETS l SHEET 2.

ww@ W Unirse airfares. #PATENT l OFFICE.

Jamas B. Barros-m, or nnfrnorr, MICHIGAN, Assrsnon To THE REM License. l

To all whom it may concern p n A Be it known that l, Jaimes B. Karmann, a

citizen of the l i it is a further 'objecto the' invention to prominimized.

vide an improved method of coil construction whereby thev cost of production will be Other and further'objects andY advantages ot' the present inventionwill be apparent from vthe following description, reference being had to the accompanying drawings, wherein preferred einbodimentsvoi the present invent-ion are clearly shown.

In the drawings:

Figure l is a longitudiifiaisectional View of an ignition coil embodying the present intention.

Fig. 2 a sectional view are of rig. i. f

Fig. 3 is an end. view ot the coil housing.

Fig. 4 is a perspective View or the coil core in the initial stage or assembly.

Fig, 5 is a perspective View oi the coil windings which Vare formed bc'foreiassembling upon the core'gand Fig. 6 is a perspective View or" the core showing the manner in which certain of the laminated portions of the core bent from their normal position in order to permit the assembling oiz the coil upon the core.

In the drawings,.20 designates the ignition coil core which includes' a base portion 21, and projecting vthrougl'i said base,A a straight leg 22and tfshaped ings 23 and 25 having their Aouter free ends 24 and 26 respective-ly arranged to face in toward the outer free end. of the straight leg 22. These endsl 24 and 26 are spaced from the leg 22 in order toA provide air gaps 2"? and 28.

The core 2O consists of a plurality of superimposed laminations each formed Vin the manner described, and these laminations are secured together at the base portion by Lmeans of a channel member 3G of non-magnetic material which clamps together the taken on ythe line Specification f Letters Patent initedStat/es of America, residing at Detrolt, countylef lqifayne, State- Y ELECTRIC .AWY, A CORPORATION OF INDIANA. y

rNniiorrroN-oorn' Patented Deo. 27, 1921. 191e.y seria; Nit 303,829. base pont-ions of said laminations and is held in ositron-by means of rivets 31 and 32.

heeorl portion designated as a Whole by numeral 35 includes a tube of insulation 36 Vabout which is Wound the primary Winding Winding 37 is surrounded by a tube of insulatiyon 38 about which is Wound the secondary winding 39. The ends and outer cylindrical-l` surface of the coil 39 are inclosed by Wrappings of insulating material 40, 41 and 42.

ln orderto assemble the coil 3 5 upon the straight legj22 and laminat composing the L-shaped legs23 and 25 are spread apart and bent away from the straight leg as shown in Fi'gfG. When the clearance between the ends 24 and 26 in the outer end of the leg 22i's suiiicient, the coil 35 may be `assembled.; upon the straight leg 22 in the position shown in Fig. 1. After this operation has. been performed the laminae composing legs 23 and 25 are bent back again into the 'normal position shown in Fig. 4 and are clatixpedy together in this position by means of a channel member 45, which surrounds the outer free ends of theleg inemvbers 22 23 land 25 and is secured in position by means of rivets 46, 47 and 48.

The fcoil isnow ready for assembly within the coilldliousing. This hLousing consists of a chan'n lr'shaped base member 50 upon the under sideef which is secured a .bracket 51 by 1neans'of-which the coil housing may be attached te any suitable support. To the flanges ofthe-base are secured the ends of the intermediate section 52 of the housing which is U-sha ed-in section and is coin structed prefrgly dimm-conducting mate: rial. The housigincluclesend sectibnsf and 54 which are 'foied nndfprifx-idedwith flanges 55 and 56, respectively, so as to fit over the end edges of the intermediate section 52 and the end edges ofi-the base member 50. The channel member 30 is attached to the end 53-by means of screws 57, and the channel member 45 is secured to the end 54 by means of screws-58. In this manner the core-20 together 'with the channel members 30 and 45 serves/'as a tie member for tying together the intermediate end portions of the housing, while the channel members 30 and 45 serve as means for supporting the coil within the housing.

Where the induction coil is used` in con- /nection with ignition apparatus in which a condenser is employed, this condenser may be inclos'ed within the housing described. In the embodiment of the invention shown the condenser is inclosed within a condenser case 6() which is supported within the housing upony the base portion 50.

The intermediate section 52 vsupports a high tension terminal ($1 -to which one end of the secondary winding 39 is attached, thc other end being grounded in any Asuitable manner. The ends ot' the primary winding 3T are connected in any suitable manner -with terminals (32 and 63 which are mounted upon the end member lVhere 'the induction coil is used for ignition purposes, one of these primary yterminals may he connected with the ignitionhtimer and the other with Non-conducting Vchannel members and may be used further to insulate the windings fiom the core.

It has been found that by constructing the induction coil core in the manner described that the eiiciency of the coil is greatly increased by reason otfutjvhe fact that the greatest number of linx lines are made to encircle the turns of the coil windings, and that the number of flux lines which are ineffective has been reduced to a minimum.

in the embodiment of the invention shown.

the core is provided with two L-shaped legs which face in toward the straight leg about which the coil is arranged. this Vmanner two magnetic circuits each having an air gap encircle the turns of the coil windings. In providing for an. air gap in the `magnetic circuit in order tointroduce a 'given reluctance in the circuit, it is advantageous to have vthe area ot the gap 'as ygreat as 'possible in order that the distance acoss the gap or length of gap may be 'proportionally large. lf the length of gap is relatively large, then relatively slight variations inthe dimensions of the laminations are 'permissible since the reluctance of the circuit will not be so materially affected as where the gap is relatively short. Hence the 'desired length of gap may bemaintained fairly accurately without requiring actual machining of the core after the core laminations have been assembled. In order tosecure proper amount of gap aree it has been found preferable, from the standpoint of economy of space and economy in the amount of material required to the core, to provide a. plurality of gaps having .a combined area equal to the area required to provide the necessary reluctance. In this manner the distance across the 'gaps may be made sntiiciently great so that the reluctance will not be materially ali'ected by any variations in the dimensions ofthe punched laminationswhich compose the core.

rThe method of assembling the coil upon the core which has been described permits the formation of the core of a series of punched laminat-ions all of the same size. It'

,this method of assembly were not resorted to it would be necessary to form certain parts of the core separately from the others,

as -i'or example, to build up the L-shaped legs separately from the base of the core and assemble these `Lshaped legs in position upon the base after the coil has been placed in position upon the straight leg'.` It is obvious that it is more economical to imm the core of a'series of lami-nations all of the same shape and dimensions rather than to provide for sets ot punchings which vary in shape and dimensions.

While the form of mechanism herein shown and described constitutes a preferred form of embodiment of the invention, it is -to 'be understood .that other forms mightbe adopted, all coming within the scope of the claims which follow.

I claim.:

'1. In an induction coil, the combination with primary and secondary windings; of a core including a base portion and integral branch portions providing two magnetic circuits threading said windings and each magnetic circuit being provided with an air gap having a substantially greater area than the sectional area of the base portion.

.2. In: an induction coil, the combina-tion with primary and secondary windings; of a core including a base portion, a straight leg extending from said base portion and through and beyond said windings, and .L- shaipcd legs extending from the base portion and Jlocated outside said windings rand facing in Vtoward the straight leg but spaced therefrom `to provide air gaps, the portions'of the yi..shaped llegs thus facing in eu ch having a Vsectional .area `greater than the sectional arca or the base portion or other portions of the L-shaped legs.

3. In an induction coll, :the combination Wlth primary and secondary windmgs; o a4 core comprising a base portion, a straight leg vSii and a plurality of L-shaped legs extending v vfrom the base, said L-shaped legs being ari diete portion; and means for attaching said core to the end members whereby lthe intermediate portion is'held in position between the end members and the-coil is supported within the housing.'

5. in an induction coil, the combination with prima and secondary windings; of a core upon W "oh said windings are mounted.

said core including a. plurelit f of leminations which are heid together along opposite edges o channel members; a housing for the coil ineiuding end members and en intermediate portion; and means for attaching said'chennei members to the end members of the housintermediate portion'is held ing whereby the in position between theend portions and of said core to an adjacent end member of said housing; said core.

In testimony whereof I aiiixxmy signature.

JAMES B. REPLOGLE.

and windings supported by 25 Witnesses:

IDA-F. Voogmms, L. L. Hosmn. 

